JP7609665B2 - Surface grinding equipment - Google Patents

Description

The present invention relates to a surface grinding device, and in particular to a surface grinding device equipped with a sensor mechanism that can accurately detect the position of the workpiece surface to be machined.

In surface grinding devices that use a grinding wheel supported by a wheel spindle that extends in a roughly horizontal direction along the top surface of the worktable to grind the top surface of a workpiece placed on the worktable, some devices are equipped with a contact-type detection sensor that detects the position by contacting the surface of the workpiece.

For example, Patent Document 1 discloses a surface grinding machine having a work table that can move back and forth in the left-right direction and a grinding wheel that can move in the front-back direction, in which a sensor unit equipped with a touch probe is attached to the side of the grinding wheel head.

The touch probe disclosed in the document has a stylus at the tip that contacts the top surface of a reference block placed on the work table and the top surface of the workpiece. This allows the height from the work table to the top surface of the reference block and the top surface of the workpiece to be detected, and the amount of stock removal to be performed is calculated by a calculation means.

For example, Patent Document 2 discloses an automatic grinding device that has a contact sensor that detects the position of the workpiece in the cutting direction and feed direction, calculates the range of relative movement of the grinding wheel and table based on the position information detected by the sensor, and automatically starts machining with the grinding wheel.

The detection sensor disclosed in the document has a probe that is attached to the side or front of the wheel cover and protrudes downward, and a roughly spherical contactor attached to the lower end of the probe. The detection sensor detects the position of the workpiece or table when the contactor comes into contact with the workpiece or table.

JP 2002-52444 A JP 2020-110893 A

However, the surface grinding device of the above-mentioned conventional technology had some areas that needed improvement in terms of measuring the workpiece using the detection sensor in order to improve the accuracy of the grinding process.

Specifically, in conventional surface grinding devices, even if a sensor such as a touch probe that detects the position information of the workpiece is installed near the grinding wheel, the measurement point measured by the detection sensor is located away from the point where the workpiece is ground by the grinding wheel.

In other words, even if the detection sensor is provided near the grinding wheel, for example, on the side of the wheel head as in the conventional technology disclosed in Patent Documents 1 and 2, and the detection sensor is moved up and down, the contact position between the contact of the detection sensor and the workpiece will be away from the contact position between the grinding wheel and the workpiece.

Therefore, in conventional surface grinding devices, the measurement error can be large due to the distance between the measurement point by the detection sensor and the grinding point by the grinding wheel, making it difficult to improve the accuracy of measurements by the detection sensor.

The present invention was made in consideration of the above circumstances, and its purpose is to provide a surface grinding device that can measure the work surface with high accuracy using a detection sensor and grind the workpiece with high precision.

The surface grinding apparatus of the present invention comprises a work table for holding a workpiece, a grinding wheel for grinding the workpiece held on the worktable while rotating it, a wheel spindle head having a wheel shaft for supporting the grinding wheel, a detection sensor for detecting the position of the machined surface of the workpiece, and a sensor support mechanism provided on the wheel spindle head for movably supporting the detection sensor, wherein the sensor support mechanism comprises a swivel cam shaft extending toward the holding surface of the worktable for holding the workpiece and capable of reciprocating in the direction of its axis and rotatable about its axis, and an arm member provided on the swivel cam shaft for supporting the detection sensor at a position radially offset from the axis, wherein the detection sensor moves in a direction along the axis, rotates about the axis to approach and move away from the worktable , and rotates about the axis to detect the machined surface at a position close to the grinding wheel .

According to the surface grinding device of the present invention, a detection sensor that detects the position of the workpiece surface to be machined and a sensor support mechanism that is provided on the wheel head and movably supports the detection sensor, the sensor support mechanism having a swivel cam shaft that extends toward the holding surface that holds the workpiece on the worktable and is reciprocable in the direction of the axis and rotatable about the axis, and an arm member that is provided on the swivel cam shaft and supports the detection sensor at a position radially offset from the axis, the detection sensor moves in a direction along the axis while rotating about the axis to approach and move away from the worktable. With this configuration, the surface grinding device can bring the measurement point of the detection sensor closer to the grinding point of the workpiece by the grinding wheel, thereby increasing the measurement accuracy of the workpiece surface by the detection sensor, and grinding the workpiece with high precision.

According to the surface grinding device of the present invention, the sensor support mechanism includes a drive means for feeding the swivel cam shaft in the direction of the axis, a cam follower having a roller for movably supporting the swivel cam shaft, and a cam groove formed on the swivel cam shaft in which the roller is fitted and supported by the cam follower, the cam groove extending in the direction of the axis and inclining obliquely in the circumferential direction near the upper end. With this configuration, the sensor support mechanism can suitably feed the detection sensor from a retracted position away from the workpiece where the workpiece is not measured to a detection position where the workpiece is measured, or in the opposite direction.

For example, when moving from the retracted position to the detection position, the detection sensor is pushed by the drive means and sent in the direction of the axis of the swivel cam shaft to approach the workpiece. Then, when the detection sensor approaches the workpiece, it rotates around the axis of the swivel cam shaft to approach the grinding point of the workpiece. Therefore, the detection sensor moves from the retracted position to the detection position close to the grinding point of the workpiece on an appropriate trajectory that does not collide with the wheel head, etc. Then, highly accurate measurements are performed by the detection sensor near the grinding point of the workpiece.

According to the surface grinding device of the present invention, the driving means may be an air cylinder that drives the swivel camshaft with a piston rod connected to the swivel camshaft. With this configuration, the detection sensor is driven by air pressure supplied to the air cylinder, and is sent in the direction of the axis of the swivel camshaft to approach the workpiece, and also rotates around the axis of the swivel camshaft to approach the grinding point of the workpiece. Thus, the detection sensor is moved with high precision and efficiency by using the air pressure.

In addition, according to the surface grinding device of the present invention, the cam followers may be provided in pairs facing each other with the swivel cam shaft at the center, and the cam grooves may be formed in pairs on the outer periphery of the swivel cam shaft to correspond to the cam followers. This enables highly accurate and efficient linear swivel feed of the detection sensor.

In addition, according to the surface grinding device of the present invention, the detection sensor rotates around the axis and detects the workpiece surface at a position close to the grinding wheel. This allows for highly accurate measurements with small errors.

In addition, according to the surface grinding device of the present invention, the detection sensor may be a touch probe that contacts the workpiece surface to detect the position. This allows the position of the workpiece to be detected with high accuracy by contacting the contact of the detection sensor with the workpiece surface.

1 is a perspective view showing a schematic configuration of a surface grinding device according to an embodiment of the present invention; 2 is a front view showing the vicinity of a grinding wheel and a sensor mechanism of the surface grinding device according to the embodiment of the present invention. FIG. 2 is a side view showing the vicinity of a grinding wheel and a sensor mechanism of the surface grinding device according to the embodiment of the present invention. FIG. 2 is an exploded perspective view showing a schematic configuration of a sensor support mechanism of the surface grinding machine according to the embodiment of the present invention; FIG. 5 is a view showing the vicinity of a cam groove of a sensor support mechanism of the surface grinding machine according to the embodiment of the present invention. FIG. 3A and 3B are plan and side views showing a state in which a detection sensor of the surface grinding device according to the embodiment of the present invention is in a retracted position. 3A and 3B are a plan view and a side view showing a state in which a detection sensor of the surface grinding device according to the embodiment of the present invention is fed. 1A is a plan view showing a state in which a detection sensor of a surface grinding device according to an embodiment of the present invention is at a detection position, and FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A surface grinding device according to an embodiment of the present invention will be described in detail below with reference to the drawings.
FIG. 1 is a perspective view showing a schematic configuration of a surface grinding device 1 according to an embodiment of the present invention.

As shown in FIG. 1, the surface grinding device 1 is a machine tool that grinds the surface of a workpiece W. The surface grinding device 1 is, for example, a CNC (Computerized Numerical Control) grinding machine, and has an operation panel (not shown) that performs automatic numerical control.

The surface grinding device 1 has a grinding wheel 2 as a tool for grinding the workpiece W, and a work table 4 for holding the workpiece W. The rotating grinding wheel 2 grinds the surface of the workpiece W, which is the surface to be machined.

The surface grinding device 1 may be, for example, a CNC surface grinding machine that performs surface grinding on the top surface of the workpiece W, or a CNC form grinding machine that can grind complex shapes. The surface grinding device 1 may also be, for example, a gate-type grinding machine, or any other type of grinding machine.

The work table 4 can move back and forth horizontally in the left-right direction when viewed from the front (hereinafter referred to as the "X direction" as appropriate). The grinding wheel 2 is mounted on a grinding wheel head 3 that is configured to move back and forth in the up-down direction (hereinafter referred to as the "Y direction" as appropriate). The grinding wheel head 3 that supports the grinding wheel 2 is supported by a saddle 15 that is configured to move back and forth horizontally in the front-to-back direction (hereinafter referred to as the "Z direction" as appropriate).

The surface grinding device 1 may be a column-type surface grinding machine, in which case the grinding wheel head 3 is supported by a column that is configured to be able to move back and forth in the Z direction. The work table 4 may also be configured to be able to move back and forth in the Z direction.

A wheel shaft (not shown) that supports the grinding wheel 2 is rotatably mounted on the wheel shaft head 3. The grinding wheel 2 supported by the wheel shaft head 3 rotates together with the wheel shaft and moves together with the wheel shaft head 3 in the Y and Z directions.

The grinding wheel 2 is formed in a substantially circular disk shape. The surface grinding device 1 has a rotation drive means (not shown), such as a motor, for example, that rotates the grinding wheel 2. The grinding wheel 2 comes into contact with the surface of the workpiece W while rotating, thereby grinding the surface of the workpiece W.

The grinding wheel 2 is covered by a wheel cover 16 that is open downward. As described above, the grinding wheel 2 is supported by the wheel head 3 that moves in the Y and Z directions. Therefore, the grinding wheel 2 moves in conjunction with the wheel head 3 relative to the work table 4 in the Y and Z directions.

Below the grinding wheel 2, a work table 4 is provided as a support means for placing the workpiece W. The work table 4 is, for example, an electromagnetic chuck with an electromagnet or the like inside, and can support the placed workpiece W by magnetic force so that it does not move.

As mentioned above, the work table 4 is configured to be movable relative to the grinding wheel 2 in the X direction, which is the feed direction. This allows the work W to be moved to adjust the relative position of the grinding wheel 2 and the work W in the X direction. In this way, by moving the work table 4 and the wheel head 3 relative to each other, the relative position of the grinding wheel 2 and the work W can be changed in three axial directions, i.e., the X direction, Y direction, and Z direction.

The grinding wheel 2 is supported by a grinding wheel head 3, and the work table 4 is supported by a feed means (not shown) that is numerically controlled by a numerical control means provided on an operation panel (not shown), and moves back and forth relative to each other in the aforementioned directions.

The grinding area where the grinding wheel 2 and the work table 4 are arranged may be covered by a housing (not shown). The housing has an opening through which the worker can set and remove the work W, and the opening is provided with a door (not shown) that can be opened and closed.

The surface grinding device 1 is equipped with a sensor mechanism 5 that detects the position of the workpiece W's surface to be machined. The sensor mechanism 5 has a detection sensor 10 that detects the position of the workpiece W's surface to be machined, and a sensor support mechanism 20 that is provided on the grinding head 3 and movably supports the detection sensor 10.

The detection sensor 10 detects the position of the workpiece W in the cutting direction of the grinding wheel 2, i.e., the Y direction, and also detects the position of the workpiece W in the feed direction perpendicular to the cutting direction, i.e., the X direction and Z direction. For example, the detection sensor 10 is a contact-type sensor that has a probe 11 that protrudes downward and a contact 12 provided at the tip of the probe 11.

In this way, because the detection sensor 10 is a touch probe that contacts the workpiece surface to detect the position, the contact 12 of the detection sensor 10 contacts the workpiece surface of the workpiece W, allowing the position of the workpiece W to be detected with high accuracy.

In addition, various other sensors may be used as the detection sensor 10, such as a non-contact sensor that detects the presence or absence of the workpiece W using laser light or the like, a non-contact sensor such as an air sensor, an AE sensor having a piezoelectric element that detects vibrations, etc.

The detection sensor 10 is mounted on the wheel head 3, and therefore moves in the Y and Z directions together with the wheel head 3. The detection sensor 10 is attached to the rear of the wheel cover 16, but it may also be attached to the side or front of the wheel cover 16.

A reference block or reference plate (not shown) may be provided near the work table 4 to serve as a reference when the detection sensor 10 measures the position of the work W. A roughly spherical reference sphere or the like may also be provided on the top surface of the reference block to serve as a reference for position measurement.

FIG. 2 is a front view showing the grinding wheel 2 and the sensor mechanism 5 of the surface grinding device 1 and their vicinity.
As shown in FIG. 2, in the surface grinding machine 1 according to this embodiment, a sensor mechanism 5 for detecting the position of the workpiece W is provided on the right side of the grinding wheel 2 when viewed from the front.
In this embodiment, an example is given in which the sensor mechanism 5 is provided on the right side of the grinding wheel 2, but the sensor mechanism 5 may be provided on the left side of the grinding wheel 2.

FIG. 3 is a side view showing the grinding wheel 2 and the sensor mechanism 5 of the surface grinding device 1 .
3, the sensor mechanism 5 is provided on the wheel head 3 on the back side of the grinding wheel 2. As described above, the sensor mechanism 5 has the detection sensor 10 that detects the position of the processed surface of the workpiece W, and the sensor support mechanism 20 that movably supports the detection sensor 10.

2 and 3, the detection sensor 10 is supported so as to be movable between a retreat position 13 where the workpiece W is not measured and a detection position 14 where the workpiece W is measured.
Specifically, the sensor support mechanism 20 has a swivel cam shaft 21 that rotatably supports the detection sensor 10. The swivel cam shaft 21 extends toward the holding surface of the work table 4 that holds the workpiece W, and is capable of reciprocating in the direction of the axis, i.e., the Y direction, and of rotating about the axis.

Near the lower end of the swivel camshaft 21, an arm member 27 is provided that supports the detection sensor 10 at a position radially offset from the axis of the swivel camshaft 21. That is, the detection sensor 10 moves in the Y direction along the axis of the swivel camshaft 21 while rotating around the axis of the swivel camshaft 21, approaching and moving away from the work table 4.

The retracted position 13 of the detection sensor 10, which does not detect the workpiece W, is located above the grinding point of the grinding wheel 2, i.e., the lowest part of the outer circumference of the grinding wheel 2, and is located rearward away from the grinding point.

More specifically, the detection sensor 10 is located in a position raised close to the central axis of the grinding wheel 2, and rotated approximately 180 degrees rearward around the axis of the swivel cam shaft 21. This ensures that the detection sensor 10 does not get in the way when machining the workpiece W.

The detection position 14 of the detection sensor 10 that detects the processed surface of the workpiece W is located at a position where the contact 12 at the tip of the probe 11 is lower than the grinding point of the grinding wheel 2 and close to the grinding point of the grinding wheel 2.

That is, the detection sensor 10 descends from the retracted position 13 in the Y direction along the swivel cam shaft 21 and rotates together with the arm member 27 around the swivel cam shaft 21 to move to the detection position 14 close to the grinding point of the grinding wheel 2.

With this configuration, the surface grinding device 1 can bring the measurement point of the detection sensor 10 closer to the grinding point of the workpiece W by the grinding wheel 2, thereby increasing the measurement accuracy of the surface of the workpiece W by the detection sensor 10, and enabling the workpiece W to be ground with high precision.

FIG. 4 is an exploded perspective view showing a schematic configuration of the sensor support mechanism 20. As shown in FIG.
4, the sensor support mechanism 20 includes a rotating cam shaft 21 having an arm member 27 for supporting the detection sensor 10 so as to be rotatable in the Y direction, and an air cylinder 30 as a driving means for moving the detection sensor 10.
The turning cam shaft 21 has a generally cylindrical shape extending in the Y direction, and as described above, is provided so as to be capable of reciprocating and rotatable along its axis.

Specifically, the swivel camshaft 21 is fitted inside a pair of upper and lower support bushes 25. The support bushes 25 are, for example, sliding bearings, and support the swivel camshaft 21 so that it can move freely in the direction of the axis and rotate freely around the axis. The pair of support bushes 25 that support the swivel camshaft 21 are fixed near the side of the grinding axle head 3 (see Figure 1) by bush holders, which are support members 26.

An arm member 27 is provided near the lower end of the swivel cam shaft 21, and a detection sensor 10 is provided near the tip of the arm member 27 away from the swivel cam shaft 21. This allows the detection sensor 10 to rotate freely around the axis of the swivel cam shaft 21.

An air cylinder 30 is provided above the swivel camshaft 21, which uses air pressure to move the swivel camshaft 21 in the Y direction. The air cylinder 30 is a double-acting air cylinder that uses air pressure to move the piston rod 31 up and down. The vicinity of the lower end of the piston rod 31, which is fitted inside the air cylinder 30, is connected to the vicinity of the upper end of the swivel camshaft 21 via a floating rotary joint so that it can rotate freely.

The air cylinder 30 is fixed to the wheel head 3 via a support 33, a support pillar 34, a support member 26, etc. That is, a plurality of supports 34 extending in the vertical direction, i.e., the Y direction, along the swivel cam shaft 21 are provided on the upper part of the support member 26, and a support 33 that supports the air cylinder 30 is fixed near the upper end of the support pillar 34.

An air supply device (not shown) is connected to the air cylinder 30 via air piping 32. The air supply device pressurizes and depressurizes the inside of the air cylinder 30, and sends air to the inside of the air cylinder 30, which serves as a driving source for moving the piston rod 31 up and down.

The driving means for moving the detection sensor 10 of the sensor support mechanism 20 up and down is not limited to the air cylinder 30. The driving means of the sensor support mechanism 20 may be other driving means such as a hydraulic cylinder driven by hydraulic pressure, or an electric actuator having a motor and a ball screw, etc., and driven by electricity.

A cam follower 28 having a roller 29 that movably supports the rotating cam shaft 21 is provided near the upper portion of the support member 26. A cam groove 22 into which the roller 29 fits is formed on the outer periphery of the rotating cam shaft 21.

The cam followers 28 are provided in pairs, facing each other with the revolving camshaft 21 at the center. A pair of cam grooves 22 are formed on the outer periphery of the revolving camshaft 21 to correspond to the pair of cam followers 28. In other words, the cam grooves 22 are formed on both sides of the outer periphery of the revolving camshaft 21 so that their positions are approximately 180 degrees opposite each other on the outer periphery.

The cam follower 28 is fixed to the grinding head 3 via the support member 26. Therefore, the cam follower 28 does not move relative to the grinding head 3. The swivel cam shaft 21 moves while being supported by the roller 29 of the cam follower 28 fitted in the cam groove 22. In other words, the swivel cam shaft 21 moves so that the roller 29, which is in a predetermined fixed position, follows the cam groove 22.

A protective cover 35 may be provided on the outside near the support 34 to cover the support 34 and the swivel cam shaft 21. This can prevent grinding debris and the like from adhering to the cam groove 22 of the swivel cam shaft 21.

FIG. 5 is a diagram showing the vicinity of the cam groove 22 of the sensor support mechanism 20. As shown in FIG.
5, a linear groove portion 23 extending in the axial direction, i.e., in the Y direction, is formed in the cam groove 22 formed on the outer periphery of the revolving camshaft 21. Further, in the vicinity of the upper end of the revolving camshaft 21, a revolving groove portion 24 inclined in the oblique circumferential direction is formed in the cam groove 22. That is, the revolving groove portion 24 is formed in a substantially spiral shape on the outer periphery of the revolving camshaft 21.

Referring to Figures 4 and 5, when the roller 29 of the cam follower 28 moves while supporting the linear groove portion 23, the swivel cam shaft 21 moves linearly in the Y direction. On the other hand, when the roller 29 of the cam follower 28 moves while supporting the swivel groove portion 24, the swivel cam shaft 21 is guided by the roller 29 and the cam groove 22 and moves in the Y direction while rotating. That is, the swivel cam shaft 21 moves in the Y direction while rotating in a generally spiral shape.

With this configuration, the sensor support mechanism 20 can suitably move the detection sensor 10 from the retracted position 13, where the sensor is away from the workpiece W and does not measure the workpiece W, to the detection position 14, where the sensor measures the workpiece W, or in the opposite direction.

The cam followers 28 are provided in pairs facing each other with the swivel cam shaft 21 at the center. A pair of cam grooves 22 are formed on the outer periphery of the swivel cam shaft 21 to correspond to the pair of cam followers 28. This enables highly accurate and efficient linear swivel feed of the detection sensor 10.

Next, a process in which the detection sensor 10 moves from the retracted position 13 to the detection position 14 will be described in detail with reference to FIGS.
Fig. 6A is a plan view showing a state in which the detection sensor 10 is in the retracted position 13. Fig. 6B is a side view showing a state in which the detection sensor 10 is in the retracted position 13.

Referring to Figures 6(A) and 6(B), in the retracted state, the detection sensor 10 is in a retracted position 13 that is above and away from the holding surface of the work table 4 and rearwardly away from the grinding wheel 2.

Fig. 7A is a plan view showing a state in which the detection sensor 10 is being fed, and Fig. 7B is a side view showing a state in which the detection sensor 10 of the surface grinding device 1 is being fed.
7(A) and 7(B), when detecting the workpiece W, the detection sensor 10 moves from the retracted position 13 to approach the holding surface of the worktable 4, i.e., to approach the workpiece W.

Specifically, the air pressure supplied to the air cylinder 30 is used as a power source to push the rotating cam shaft 21 downward by the air cylinder 30, and the detection sensor 10 moves downward together with the rotating cam shaft 21 and the arm member 27.

At this time, the rotating camshaft 21 moves in a substantially linear fashion from top to bottom along the axis, because the linear groove portion 23 of the cam groove 22, which extends linearly along the axis, is guided by the roller 29 of the cam follower 28. Therefore, the detection sensor 10 held near the tip of the arm member 27 also moves in a substantially linear fashion from top to bottom along the rotating camshaft 21.

Fig. 8A is a plan view showing a state in which the detection sensor 10 is at the detection position 14. Fig. 8B is a side view showing a state in which the detection sensor 10 is at the detection position 14.
Referring to Figures 8 (A) and 8 (B), when the rotating cam shaft 21 descends and the rotating groove portion 24 of the cam groove 22 reaches the roller 29 of the cam follower 28, the spirally formed rotating groove portion 24 is guided by the roller 29.

As a result, the swivel camshaft 21 moves downward while rotating in a spiral manner, with the swivel groove portion 24 of the cam groove 22 being guided by the roller 29 of the cam follower 28. The arm member 27 provided near the lower end of the swivel camshaft 21 moves downward while rotating around the axis of the swivel camshaft 21. Therefore, the detection sensor 10 provided near the tip of the arm member 27 moves downward in a spiral manner while rotating around the swivel camshaft 21.

Then, the detection sensor 10 approaches the grinding wheel 2 while moving closer to the holding surface of the work table 4. More specifically, the detection sensor 10 rotates downward and approaches the grinding point of the workpiece W by the grinding wheel 2.

In this manner, the detection sensor 10 moves linearly downward and approaches the workpiece W, and then rotates about the rotating cam shaft 21 to approach the grinding point of the workpiece W.
Then, the detection sensor 10 approaches the grinding wheel 2 and detects the processed surface of the workpiece W in the vicinity of the grinding point, thereby performing highly accurate measurement with small error.

In this way, in the surface grinding device 1 according to this embodiment, the detection sensor 10 is moved with high precision and efficiency using air pressure, and highly accurate measurements are performed by the detection sensor 10 near the grinding point of the workpiece W.

For example, the machining surface of the workpiece W can be detected with high precision by a detection sensor 10 such as a touch probe. From the highly accurate detection results by the detection sensor 10, the amount of grinding allowance of the workpiece W is accurately calculated by a calculation means (not shown).

The sensor mechanism 5 according to this embodiment can also be used as a means for accurately checking the surface shape of the workpiece W. For example, measurements using a detection sensor 10 such as a touch probe may be used in a machining method that uses CAD data to perform numerically controlled machining of the workpiece W.

Specifically, a measurement path for the workpiece surface of the workpiece W may be generated using CAD data, the shape of the workpiece surface may be measured along the measurement path by the detection sensor 10 to obtain point cloud data, and shape data for the workpiece surface may be generated from the point cloud data. Then, a machining path may be calculated based on the obtained high-precision shape data for the workpiece surface of the workpiece W, and machining of the workpiece W may be performed by a machining program that moves the grinding wheel 2 and the workpiece W relatively along the machining path.

The present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention.

REFERENCE SIGNS LIST 1 Surface grinding device 2 Grinding wheel 3 Wheel spindle head 4 Work table 5 Sensor mechanism 10 Detection sensor 11 Probe 12 Contact 13 Retracted position 14 Detection position 15 Saddle 16 Wheel cover 20 Sensor support mechanism 21 Swivel cam shaft 22 Cam groove 23 Linear groove portion 24 Swivel groove portion 25 Support bush 26 Support member 27 Arm member 28 Cam follower 29 Roller 30 Air cylinder 31 Piston rod 32 Air piping 33 Support 34 Support 35 Protective cover W Work

Claims (5)

A work table for holding a workpiece;
a grinding wheel for grinding the workpiece held on the work table while rotating the workpiece;
a grinding wheel head provided with a wheel shaft supporting the grinding wheel;
A detection sensor for detecting the position of the processed surface of the workpiece;
a sensor support mechanism that is provided on the wheel head and movably supports the detection sensor;
The sensor support mechanism includes a revolving cam shaft extending toward a holding surface of the work table that holds the workpiece, the revolving cam shaft being reciprocable in a direction of an axis and rotatable about the axis;
an arm member that is provided on the rotating cam shaft and supports the detection sensor at a position radially offset from the axis of the rotating cam shaft,
The surface grinding device is characterized in that the detection sensor moves in a direction along the axis, rotates around the axis to approach and move away from the work table , and detects the workpiece surface at a position close to the grinding wheel by rotating around the axis . The sensor support mechanism includes a drive means for moving the rotating cam shaft in the direction of the axis of the rotating cam shaft;
a cam follower having a roller for movably supporting the rotating cam shaft;
a cam groove formed on the rotating cam shaft, the roller being fitted into the cam groove and supported by the cam follower;
2. The surface grinding device according to claim 1, wherein the cam groove extends in the direction of the axis and is inclined obliquely in the circumferential direction near an upper end thereof. The surface grinding device according to claim 2, characterized in that the driving means is an air cylinder that drives the swivel camshaft with a piston rod connected to the swivel camshaft. The cam followers are provided in a pair to face each other about the rotating cam shaft,
4. The surface grinding device according to claim 2, wherein a pair of said cam grooves are formed on an outer periphery of said swivel cam shaft so as to correspond to said cam followers. 5. The surface grinding apparatus according to claim 1, wherein the detection sensor is a touch probe that detects the position of the workpiece by contacting the workpiece surface.

Images